iCloud keyvalue pair, notification when stored safely in cloud?

Hi, is there a notification our app can register for to know when our key value pair data is stored up safely to the cloud? We get a notification NSUbiquitousKeyValueStoreDidChangeExternallyNotification when the app recvs data from the cloud, but how do we known when our KV data is up safely. e.g. whebn testing our app, when can we delete the app after setting iCloud key/values?

This is not necessarily an iCloud Drive question, could refer to old icloud, but that is the only iCloud tag that was provided to select from.
iCloud keyvalue pair, notification when stored safely in cloud?
 
 
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